Objective To assess the expression level of D-Tyr-tRNATyr deacylase(DTD) in SAMP8 mice and speculate the function of DTD in disorders associated with Alzheimer's disease(AD).Methods Altogether 12 SAMP8 mice and 12...Objective To assess the expression level of D-Tyr-tRNATyr deacylase(DTD) in SAMP8 mice and speculate the function of DTD in disorders associated with Alzheimer's disease(AD).Methods Altogether 12 SAMP8 mice and 12 SAMR1 mice were used in this study.Semi-quantita-tive reverse transcription-polymerase chain reaction(RT-PCR) and Western blot were performed to detect the mRNA and protein levels of DTD in the mice.Purified DTD protein was injected into lateral ventricle to investigate the function of DTD in SAMP mice.The behavior of the mice was tested by using a Step-through Test System.Results Both mRNA and protein levels of DTD were found to be significantly lower in SAMP8 mice compared with those in SAMR1 mice(P<0.05).In vivo injection of DTD protein did not lead to an obvious change in behavior of SAM mice.Conclusions DTD might function in the process of AD-associated pathology and could possibly participate in physiology process in a long-term manner to orchestrate with other regulators in order to maintain the balance of organism.展开更多
A new class of enzyme was established that hydrolyze the ester bond between D-Tyr bound onto its cognate t-RNA. The enzyme is called D-Tyr-tRNA deacylase. The three dimensional structure of the D-Tyr-tRNA deacylase fr...A new class of enzyme was established that hydrolyze the ester bond between D-Tyr bound onto its cognate t-RNA. The enzyme is called D-Tyr-tRNA deacylase. The three dimensional structure of the D-Tyr-tRNA deacylase from industrially important microorganism Bacillus lichenformis DSM13 was predicted by comparative modeling approach. Since the protein acts as a dimer a dimeric model of the enzyme was constructed. The interactions responsible for dimerization were also predicted. With the help of docking and molecular dynamics simulations the favourable binding mode of the enzyme was predicted. The probable biochemical mechanism of the hydrolysis process was elucidated. This study provides a rational framework to interpret the molecular mechanistic details of the removal of toxic D-Tyr-tRNA from the cells of industrially important microorganism Bacillus lichenformis DSM13 using the enzyme D-Tyr-tRNA deacylase.展开更多
角质层细胞间脂质做为构成皮肤屏障的主要结构脂质成分,其含量的降低或结构的改变均会影响皮肤屏障功能的稳定。脂质代谢相关酶在脂质的合成、水解和分泌中起到了重要作用。本文综述了多种与脂质代谢相关的酶,如激肽释放酶(kallikreins,...角质层细胞间脂质做为构成皮肤屏障的主要结构脂质成分,其含量的降低或结构的改变均会影响皮肤屏障功能的稳定。脂质代谢相关酶在脂质的合成、水解和分泌中起到了重要作用。本文综述了多种与脂质代谢相关的酶,如激肽释放酶(kallikreins,KLKs)、脂肪酸延长酶(elongation of very long chain fatty acids,ELOVL)、β-葡糖脑苷脂酶(β-glucocerebrosidase,GCase)、酸性鞘磷脂酶(acidic sphingomyelinase,aSMase)、鞘磷脂脱酰酶等,同时也对酶与皮肤屏障之间的密切关系进行了阐述,以期为开发针对维护和修复皮肤屏障功能的护肤产品和洗涤用品等提供理论基础。展开更多
基金Supported by National Natural Science Foundation of China (30721063)
文摘Objective To assess the expression level of D-Tyr-tRNATyr deacylase(DTD) in SAMP8 mice and speculate the function of DTD in disorders associated with Alzheimer's disease(AD).Methods Altogether 12 SAMP8 mice and 12 SAMR1 mice were used in this study.Semi-quantita-tive reverse transcription-polymerase chain reaction(RT-PCR) and Western blot were performed to detect the mRNA and protein levels of DTD in the mice.Purified DTD protein was injected into lateral ventricle to investigate the function of DTD in SAMP mice.The behavior of the mice was tested by using a Step-through Test System.Results Both mRNA and protein levels of DTD were found to be significantly lower in SAMP8 mice compared with those in SAMR1 mice(P<0.05).In vivo injection of DTD protein did not lead to an obvious change in behavior of SAM mice.Conclusions DTD might function in the process of AD-associated pathology and could possibly participate in physiology process in a long-term manner to orchestrate with other regulators in order to maintain the balance of organism.
文摘A new class of enzyme was established that hydrolyze the ester bond between D-Tyr bound onto its cognate t-RNA. The enzyme is called D-Tyr-tRNA deacylase. The three dimensional structure of the D-Tyr-tRNA deacylase from industrially important microorganism Bacillus lichenformis DSM13 was predicted by comparative modeling approach. Since the protein acts as a dimer a dimeric model of the enzyme was constructed. The interactions responsible for dimerization were also predicted. With the help of docking and molecular dynamics simulations the favourable binding mode of the enzyme was predicted. The probable biochemical mechanism of the hydrolysis process was elucidated. This study provides a rational framework to interpret the molecular mechanistic details of the removal of toxic D-Tyr-tRNA from the cells of industrially important microorganism Bacillus lichenformis DSM13 using the enzyme D-Tyr-tRNA deacylase.
文摘角质层细胞间脂质做为构成皮肤屏障的主要结构脂质成分,其含量的降低或结构的改变均会影响皮肤屏障功能的稳定。脂质代谢相关酶在脂质的合成、水解和分泌中起到了重要作用。本文综述了多种与脂质代谢相关的酶,如激肽释放酶(kallikreins,KLKs)、脂肪酸延长酶(elongation of very long chain fatty acids,ELOVL)、β-葡糖脑苷脂酶(β-glucocerebrosidase,GCase)、酸性鞘磷脂酶(acidic sphingomyelinase,aSMase)、鞘磷脂脱酰酶等,同时也对酶与皮肤屏障之间的密切关系进行了阐述,以期为开发针对维护和修复皮肤屏障功能的护肤产品和洗涤用品等提供理论基础。
